Nut-tapping machine.



C. BAERWALDB.

NUT TAPPING MACHINE APPLICATION FILEJHMEAR. 20, 1911.

Patented June 4, 1912.

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APPLICATION-FILED MAB..20, 1911.

G. BAERWALDB.

NUT TAPPING' MACHINE.

Patented June 4,1912.

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COLUMBIA PUNOORAPH 50;.WA5HINGTON, D- C- U. BAERWALDE.

NUT TAP-PING MACHINE. APPLICATION FILED MAR. 20, 1911.

Patented June 4', 1912.

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NUT TAPPING MACHINE. APPLICATION FILED MAR. 20, 1911.

1,028,526. Patented June 4,1912.

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NUT TAPPING MACHINE.

APPLIOATION FILED MABHZO, 1911.

.Patented June 4,1912.

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CARL BAERWALDE, OF CLEVELAND, OHIO.

NUT-TAPPIVNG MACHINE.

Application filed March 20, 1911. Serial No. 615,718.

Specification of Letters Patent.

Patented June 4., 1912.

To all whom it may concern Be it known that I, CARD BAERWALDE, a citizen of the United States, residing at Cleveland, in the county of Cuyahoga and State of Ohio, have invented certain new and useful Improvements in Nut-Tapping Machines, of which the following is a specification.

My invention relates to a nut tapping machine, all substantially as shown and described and particularly pointed out in the claims.

In the accompanying drawings, Figure 1 is a plan view of the machine, and Fig. 2 is a side elevation looking in from the left of Fig. 1. Fig. 3 is a sectional elevation front to rear on the line of the nearer looking bolt for the nut carrying ring. Fig. 4 is a side elevation partially in section of a planetary arrangement of gears related and adapted to operate as hereinafter fully described. Figs. 5 and 6 are sectional elevations respectively of parts showing the means for supporting and operating the tap and for raising and lowering the same, also as hereinafter fully described. Fig. 7 is a perspective view of one shape of nut and a clamping bushing or collar to hold same. Fig. 8 is a broken off part showing the support for the power shaft.

The machine as thus shown is designed more particularly for tapping nuts and the construction shown is dual or provided with means to tap two nuts side by side at the same time. However, the general mechanism would be the same if the machine were single.

To begin with the machine has flat base B, say of cast metal, and of such weight and size as to form a sufficient support for all the other fixed parts. These comprise three several triangularly disposed cylindrical or tubular standards or posts 1?, P and P Figs. 1 and 3, firmly fixed in said base and adapted to carry practically all or most of the operating parts. The said posts are rigidly connected at their top by a triangular frame F and which has no other purpose or use. Thus, the said several parts together constitute a rigid substantial main frame, and the three several operating shafts S, S and S? are supported therefrom by means as will now appear. Thus, S is the power shaft carrying sheaves 6, and which for the most part is wholly outside the frame of the machine and supported at its outer end by an elbow arm E from the base of the adjacent post P and at its other end in a bracket 6 fixed upon said post and provided on the opposite side of the post with a bearing for'shaft' S. A similar bracket 6 is fixed on post P for the other end of shaft S, while the tap operating shaft S is supported upon two rigid arms a bolted at their lower ends to the ends of the horizontally disposed yoke Y, and which is provided with sleeve bearings 3 slidably mounted on the three several posts P, P and P The arms carrying shaft S being fixed to the front sleeves of said yoke they therefore participate in the up and down movements of the yoke, as is also required. Now, having shafts and supports therefor disposed as shown and described the rest of the mechanism has to do more particularly with the operation and handling of the tap or taps 2, and the means for bringing the nuts thereto to be tapped. Inasmuch as the tap is vertically disposed in this machine the nut carrying mechanism must be horizontal, and this is deemed also to be a very material improvement in machines of this general character wherein the tap usually works horizontally. Therefore referring first to the tap 2 it is supported in a spindle 4, and collet 0 within tightening sleeve .9 and extends approximately half way into the housing H at its upper end. A bevel gearing g is sleeved upon said spindle below its end and a clutch c is fixed on said spindle above said gear and contains or carries a spring 5 within its upper exposed portion. Another bevel gear 9 is supported upon the lower end of a vertically arranged short shaft D mounted in a bearing sleeve 7 in the top of housing H and carrying a bevel gear 9 driven by a bevel gear 9 on power driven shaft S Relatively shaft S is directly over or above short vertical shaft D, Fig. 2, and gear 9 is fixed on said shaft D. Both gear 9 and gear 9" have short projections (Z on their hubs adapted to engage teeth d on the opposite edges of said clutch, and the spring 5 operates between said parts and within said clutch or spindle 4 to depress the same at certain times as will presently be seen.

Lin

ing movement on the three posts P, P and P as above described. Naturally, therefore, the said yokes, so-called, and the parts thereon gravitate downward, and if the descent is to be repeated, it must also be raised again. I have therefore provided shaft S in part for this purpose and lift cam G is fixed thereon under the middle of yoke Y at or near the center of gravity thereof and adapted to bear upon a roller 1" on the bottom of said yoke to raise the yoke and the parts it carries successively after each gravity descent. The said cam is so constructed and timed in its operation that it permits a more or less gradual descent and not an abrupt or sudden drop from be-. neath the yoke, such descent being say from high point a in Fig. 5 to the low point o or approximately like that. Then as the cam turns farther around it gradually raises said parts again and so on indefinitely. It

should have been noted earlier that'housing H is a box shaped embodiment with removable sides supported centrally on the front of yoke Y and hence moves up and down with it, as does also shaft S and said cam is fixed on shaft S between the sides of bifurcated arm A which is fixed by set screw on post P and has holes in its ends traversed by said shaft and serving as a central support for the shaft where the weightcomes upon it through said cam. While the cam C is traveling over its more depressed space the tool or tap 2 is doing its work and the reverse movement of the tap for its withdrawal occurs upon uplift of yoke Y by cam'C andas hereinafter fully described during which time the tool is raised wholly above the ring R which carries the nuts to be tapped. The said ringhas a timed rotation and is providedwith a circle of openings 12 spaced uniformly apart and adapted to receive the nuts N and the .clamping bushings or collars 13, Fig. 7,

, ber of spring metal having a central opening shaped according to the shape of the nut to be tapped and adapted to clamp and hold the nut while it is engaged by the tap both in entering and withdrawing the same, and the means for pressing the clamp on the nut will presently be seen. Any preferred edge shape may be given the nut and several such shapes are shown as examples. The essential feature, however, is the bushing 13 which holds the nut, of whatever shape, and the holes 12 extend through the ring R and are adapted to register with the holes 14 in the base and table beneath and drop the nut as the ring R is rotated to bring the finished product thereto. It will also be observed that ring R is supported on'a circular table M which has a raised dish shaped central portion m adapted to hold a supply of nut blanks and from which they are fed into the holes therefor as the ring R travels around. Said member or supplemental base M is fixed on base B but for convenience of manufacture might be a portion thereof and is provided with an annular shoulder 15 about the depth of ring R and inside the same and a fiat rim 16 on which the ring rests and upon which it is held by the two removable checks or stops 16, Fig. 1.

Now, recurring to the cam C and its operation in connection with yoke Y and incidentally to the depression and withdrawal of tool 2, it will be observed that the operation of the drill actuating parts is constantwhile the machine is at work but the said tool is first turned forward for tapping the nut and then reversed to withdraw it, and this change occurs through the several gears g, g and g in housing H and the clutch 0 fixed on spindle 4. The said several gears are in constant rotation and tapping occurs when clutch 0 is up in engagement with gear This occurs when the spindle 4c is down and under the pressure of spring 5. As to this the actual withdrawal of the tap occurs upon uplift of the spindle, clutch a shifting from gear 9 to gear gthe tap being momentarily held in the nut against end movement during this change. Of course when the spindle 4 is re versely rotated the speed of rotation may be greater or less to cause the tap to run out on its own thread until clutch c is again disengaged from gear 9, but the parts are timed to work together to the best advantage in both reverse and uplift movements. Then with all the said parts'up they remain up until ring R is carried around to bring two other blank nuts beneath the taps. Then as the parts are permitted to descend again by riding over the high point 0 of the cam the aggregate weight will rest on the tap when the point of the tap is arrested by contact with the nut and this will force spindle 4c and clutch 0 up into engagement with gear 9 and tapping will occur as described. Complete tapping of course takes place by the time the tap has passed down through the nut, and the tap will continue to rotate and move downwardly for a brief interval, or until uplift and reversal occurs as described. Now, two other operations are important in this connection and occur automatically. These consist in clamping the nuts in collars 13 to prevent their withdrawal and permit tapping operations to proceed, and in rotating ring R. For the first operation I employ a singlemechanism for each of the two collars provided for in this double machine. There might of course be only one'such mechanism or possibly three. Assuming that there is one the same comprises a cam C on shaft S as the primary member for temporarily locking the clamp 13 and the intervening mechanism consists of two bolts.

21 and 22 respectively at right angles to each other. The first bolt is supported vertically by a standard 23 fixed on base B and carrying a projection 24 at right angles at its top with a hole through the same and adapted to receive the upper end of said bolt 21 while the lower reduced end thereof is guided and confined in a hole in base B. Said bolt is also provided with a set screw 25 in its top engaged by cam C and adjustable to get the right operating position, and it is also provided with a channel lengthwise in its front engaged by a screw 26 to keep saidbolt in alinement. There is also a beveled lug or projection 27 on the bottom portion of said bolt adapted to press against the beveled end of the second bolt 22. This bolt is horizontally disposed in a barrel 28 fixed on base B and said bolt 22 is spring pressed therein to normally hold said beveled end back in respect to ring R and thus not interfere with the rotation of said ring. This also keeps bolt 22 in position to be acted on by the beveled lug 27 and to force said locking bolt inward when this occurs. To this end the ring R has horizontally disposed holes 29 in its edge corresponding to the vertical nut receiving holes 12 and entering the same so as to strike the clamping collars 13 and contract them upon the nuts, as occurs always preparatory to tapping the nut. Therefore when the cam or cams O ome around as turned they force the bolts 21 downward and these in turn force the bolts 22 inward and the nuts are clamped in their collars. That is, those that for the time are to be tapped and the rest in their turn. Locking is shown in Fig. 5. Finally the nut carrying ring R needs to be rotated about the table m and timed to always bring the holes centrally beneath the taps or tools 2, and this is done by means of an actuating rod 30 which is mounted slidably in two fixed bearings 31 and 32 at the edge of base B. This rod or bar slides lengthwise within such limits that when moved to the left Fig. 2 it will carry the ring R around as far as required to bring the next nut blanks into tapping position. To this end the said rod has a spring pressed dog or pawl 33 mounted in a head in its end adapted to engage one of the teeth 34 on the edge of ring R, and said rod is actuated by one of the arms 35 on the end of shaft S engaging arm 36 fixed on said rod, said arm having a roller 37 at either side to make a rolling engagement therewith. In fact there are two rotating arms 35 on shaft S adapted to engage opposite rollers 37 on arm 36 successively, and the spring 38 below rod 30 is fixed thereon in such way as to always draw said rod back to engaging position after being released by said arms. The dog or pawl 33 is beveled to slide back behind the projections 34, and stop 39 at its rear end prevents it thrusting forward farther than required.

As to the actuating or transmitting means from power shaft S, I show certain gears and pinions which are in due proportion one to another in size and number of teeth to get the desired movements of all the operating parts, and while the present arrangement serves my purpose it is only one of possibly many that might be adopted. However, for the present the one line of gears goes to shaft S and another to shaft S The first line comprises a pinion 40 on shaft S in mesh with arelatively large gear 41 on a short shaft S of its own and which carries a pinion 42. This meshes with gear 43 on shaft S and which carries the several cams above described and the arms for rotating ring R. The other line of gears going to shaft S which actuates the taps comprises a large gear 44 on shaft S which meshes with a gear 45 of corresponding size mounted on jointed arms 46 and 47 loose on shaft S and S, respectively, so as to maintain planetary relation between gears 44, 45 and gear 48 when shaft S is raised and lowered. Gear 48 is fixed on the end of shaft S The machine as thus described is automatic in every particular but the single one of feeding the blank nuts and this any un skilled person can do, and even the feeding of these blanks can be automatically accomplished but such mechanism is not embraced herein. For small nuts a comparatively small machine will sutlice say one with a base not exceeding twelve by fourteen inches, and the other parts in proportion, but for larger work a heavier machine with relatively larger parts will be required.

The part indicated by Y is referred to herein as a yoke, but with the head H and arms a for shaft S it really constitutes an auxiliary or movable frame adapted to slide up and down on the posts of the main frame and as operated by cam C. That is cam C bodily lifts said auxiliary frame and also assists in its lowering though it does go down by gravity for the said cam is even beneath said frame and it can descend only as the cam permits.

Obviously, while the within is a detailed description of the machine shown, necessarily, the said details may be more or less changed in at least some if not many par ticulars without departing from the spirit of the invention, assuming of course that the same functions are accomplished by such changed mechanism.

What I claim is:

1. A nut tapping machine having a horizontally disposed ring provided at regular intervals with vertically disposed openings adapted to receive the nuts to be tapped and corresponding holes in its periphery, split bushing in said openings and bolts adapted to enter said holes and force the bushingupon the nuts in clamping relation.

2. A nut tapping machine having a ring and a fixed table on which said ring is rotatably mounted, said ring having openings at intervals toreceive nuts and bushings about said nuts and having a side hole for each opening adapted to enter a bolt to thrust against said bushing and lock the nut therein.

3. A nut tapping machine having a table and a ring rotatably mounted thereon provided with openings to receive the nuts to be tapped and a hole through its periphery to each opening, in combination with a bolt adapted to be thrust in said holes successively as said ring is turned and a cam actuated device to cause said bolt to act.

4. A nut tapping machine having a centered rotatable nut carrying ring constructed as described, in combination with a bolt adapted to enter said ring and successively lock the nuts therein, a vertically disposed depressible member constructed to force said bolt inward and a rotatable cam adapted to depress said member.

5. A nut tapping machine having a vertically disposed tap spindle, a substantially triangular movable frame carrying 'said spindle and posts in the angles thereof on which the said frame slides, a housing supported from the front of said frame and means to rotate the spindle in reverse directions alternately mounted in saidhousing and comprising gears and a clutch between said gears fixed on the end of said spindle, and a rotatable cam in engagement with said frame substantially at its middle and bottom, whereby the frame is operated from its balancing point and raised and lowered.

6. A nut tapping machine comprising a main frame and rigid triangularly disposed posts on said frame, a triangular frame slidably mounted on said posts and adapted to feed downward by gravity and a housing midway on the front thereof, in combination with a tap supporting spindle and means to operate the same mounted in said housing, a lift cam arranged approximately beneath the center of said triangular frame and a roller bearing for said cam centrally on the said frame.

7. A nut tapping machine having three several fixed posts angularly disposed, and a fixed frame connecting the tops of said posts, and a horizontally disposed drive shaft supported on'said frame, in combination with a triangular frame slidably mounted on said posts between their ends, and a tap carrying spindle mounted in the front of said frame geared to said drive shaft, a transverse shaft centrally beneath said triangular frame and a cam thereon adapted to raise and lower the said triangular frame. In testimony whereof I affix my signature in the presence oftwo witnesses.

' CARL BAERVVALDE. Witnesses:

F. C. MUssUN, E. M. FIsH R.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. C. 

